WO2015113246A1 - Device for coupling laser and optical fiber and optical signal transmission system and method - Google Patents
Device for coupling laser and optical fiber and optical signal transmission system and method Download PDFInfo
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- WO2015113246A1 WO2015113246A1 PCT/CN2014/071752 CN2014071752W WO2015113246A1 WO 2015113246 A1 WO2015113246 A1 WO 2015113246A1 CN 2014071752 W CN2014071752 W CN 2014071752W WO 2015113246 A1 WO2015113246 A1 WO 2015113246A1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 267
- 239000013307 optical fiber Substances 0.000 title claims abstract description 123
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- 238000005859 coupling reaction Methods 0.000 title claims abstract description 114
- 230000008054 signal transmission Effects 0.000 title claims abstract description 73
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/4239—Adhesive bonding; Encapsulation with polymer material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/424—Mounting of the optical light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/4245—Mounting of the opto-electronic elements
Definitions
- Laser and optical fiber coupling device optical signal transmission system and transmission method
- the present invention relates to the field of optical signals, and more particularly to a coupling device for a laser and an optical fiber, an optical signal transmission system, and a transmission method. Background technique
- the optical interconnection Since the electrical interconnection has the above defects, the optical interconnection has become a key technology for solving electrical interconnection defects due to its advantages of low delay, good electromagnetic compatibility, low power consumption, and large bandwidth.
- a typical optical signal transmission based on optical interconnect technology as can be seen from Figure 1, in order to transfer electrical signals from component A to component B, the electrical signal is loaded by modulation. Forming an optical signal on the light wave, and then transmitting the formed optical signal through the optical fiber, and then receiving the optical signal by the detector, performing signal conversion, demodulation, etc., finally obtaining the source electrical signal and transmitting it to the component B, completing The entire transfer process.
- the current light source used is the laser light emitted by the laser.
- Generally used lasers have edge-emitting lasers (such as Distributed Feedback (DFB) lasers) and surface-emitting lasers (such as Vertical Cavity Surface Emitting Lasers (VCSED), compared to edge-emitting lasers.
- the surface emitting laser has the following advantages and has a huge application scenario: (1), the surface emitting laser can be directly adjusted, the modulation efficiency is high and the threshold current is small; (2), the temperature drift is small, no thermoelectric refrigeration is needed; (3), electro-optic High conversion rate and low power consumption.
- the outgoing light of the laser needs to be coupled into the core of the optical fiber.
- the laser used is a VCSEL and the fiber is a single mode fiber
- the outgoing light of the VCSEL needs to be coupled into the core diameter of the single mode fiber.
- the Mode Field Diameter (MFD) of the VCSEL emits light.
- the transverse area of the signal occupies the largest area corresponding to the diameter of the tens to hundreds of micrometers (such as 50 ⁇ 100 ⁇ ), while the core diameter of the single-mode fiber is 6 ⁇ 10 ⁇ , as shown in Figure 2. It is shown that there is a serious mode mismatch between the two, resulting in a low coupling rate between the VCSEL's outgoing light and the single mode fiber.
- Embodiments of the present invention provide a coupling device, an optical signal transmission system, and a transmission method for a laser and an optical fiber, which are used to solve the problem that the diameter of the optical signal incident on the optical fiber does not coincide with the diameter of the core diameter of the optical fiber.
- a coupling device for a laser and an optical fiber including:
- optical signal transmission component having a laser fixing component coupled to the laser and a fiber fixing component for coupling with the optical fiber, respectively;
- the refractive index of the optical signal transmission component is gradually changed, and the refractive index is closer to the central axis, and the optical signal incident on the laser coupled to the laser fixing component is concentrated or diverged, and then exits into the coupling.
- the fiber on the fiber fixing component is gradually changed, and the refractive index is closer to the central axis, and the optical signal incident on the laser coupled to the laser fixing component is concentrated or diverged, and then exits into the coupling.
- the difference between the refractive index of the outer surface of the fiber fixing member and the refractive index of the fiber cladding for wrapping the optical fiber is less than a threshold.
- the optical signal transmission component comprises: a first subcomponent and a second subcomponent, wherein:
- the first subcomponent is wrapped within the second subcomponent;
- the cross-sectional radius of the first sub-component gradually changes, and the refractive index at a position closer to the center of the cross-section is larger; the refractive index of the second sub-component is constant.
- the first sub- The component when the cross-sectional radius of the first sub-component in the optical signal transmission direction is gradually smaller, the first sub- The component is used to concentrate the optical signal;
- the first sub-component is used to diverge the optical signal.
- the cross-sectional radius of the first sub-component at the exit position of the optical signal and the mode when the optical signal is emitted from the first sub-component is:
- the optical signal transmission component includes: a third subcomponent and a fourth subcomponent, where: a fourth sub-assembly connected to the third sub-assembly at an optical signal exiting position of the third sub-assembly;
- the refractive index of the fourth sub-component is closer to the center of the circle in any cross section, the refractive index of the fourth sub-component is constant, and the refractive index of the fourth sub-component and the central axis of the third sub-component The refractive index is the same.
- the third sub-component if the length of the third sub-component is greater than a threshold, the third sub-component is configured to perform optical signals Converging, and the longer the length of the third sub-component, the higher the convergence of the optical signal; If the length of the third sub-component is less than the threshold, the third sub-component is used to diverge the optical signal, and the shorter the length of the third sub-component, the higher the divergence of the optical signal.
- a relationship between a length of the third sub-component and a mode field radius when the optical signal is emitted from the fourth sub-component is :
- A is the length of the first sub-component; the mode field radius when the optical signal is emitted from the first sub-component; ⁇ The mode field radius when the optical signal is incident on the first sub-component; ⁇ ⁇ , the ⁇ ⁇ ,
- n 2 is the refractive index at the central axis of the first sub-component; g is the focusing parameter.
- an optical signal transmission system comprising a laser, an optical fiber, and the coupling device of the laser and the optical fiber;
- the laser and the optical fiber are coupled to the coupling device through a laser fixing member and a fiber fixing member in the coupling device, respectively;
- the outgoing optical signal After the optical signal emitted by the laser converges or diverges the optical signal through the refractive index-grading optical signal transmitting unit in the coupling device, the outgoing optical signal enters the optical fiber.
- the fiber end is fixed in the fiber fixing component by glue.
- the optical fiber tail end is a cut surface at a set angle, so that the optical signal entering the optical fiber is reflected by the cut surface The optical signal is transmitted along the core diameter of the optical fiber in the optical fiber.
- the cut end of the fiber end is covered with a reflective layer for reducing optical signal leakage.
- the optical signal transmission component in the coupling device includes a first subcomponent and a second subcomponent enclosing the first subcomponent, and the The cross-sectional radius of a sub-component gradually changes, the refractive index of the position closer to the center of the cross-section is larger, and the refractive index of the second sub-component is constant, by reducing the position of the first sub-component at the exit position of the optical signal.
- the cross-sectional radius is used to converge the optical signal such that a difference between a mode field radius of the optical signal exiting the coupling device and a core radius of the optical fiber is less than a set threshold; or
- An optical signal transmitting component in the coupling device includes a third subcomponent and a fourth subcomponent coupled to the third subcomponent at an optical signal exiting position of the third subcomponent, and the third sub
- the refractive index of the fourth sub-component is constant when the refractive index of the fourth sub-component is constant, and the refractive index of the fourth sub-component is the same as the refractive index at the central axis of the third sub-component.
- concentrating the optical signal by increasing a length of the third sub-component such that a difference between a mode field radius of the optical signal emitted after the coupling device and a core radius of the optical fiber is less than a set threshold.
- a method for optical signal transmission comprising:
- the optical signal is concentrated or diverged when the optical signal is transmitted within the optical signal transmission component of the refractive index gradient in the coupling device;
- the concentrated or diverged optical signal is emitted from the coupling device into an optical fiber coupled to the coupling device.
- a laser and optical fiber coupling device is disposed between the laser and the optical fiber, and the coupling device includes an optical signal transmission component with an internal refractive index gradation, and the refractive index of the optical signal transmission component is closer to the central axis, and the available
- the optical signal incident on the laser is shaped (including the convergence or divergence of the optical signal), so that the mode field radius of the shaped optical signal is matched with the core radius of the optical fiber, and the shaped optical signal can be efficiently coupled into the optical fiber.
- FIG. 1 is a schematic diagram of optical signal transmission based on optical interconnection technology in the background art
- FIG. 2 is a schematic diagram showing a mode field mismatch of a mode field of a VCSEL emerging light and a core diameter of a single mode fiber in the background art
- FIG. 3 is a schematic structural view of a coupling device for a laser and an optical fiber according to Embodiment 1 of the present invention
- FIG. 4 is a schematic structural view of an internal-external optical signal transmission component according to Embodiment 1 of the present invention
- - a schematic structural diagram of a lower-type optical signal transmission component
- FIG. 6 is a schematic structural diagram of a transmission system according to Embodiment 2 of the present invention
- FIG. 7 is a schematic flowchart of steps of a transmission method according to Embodiment 3 of the present invention.
- FIG. 8 is a schematic diagram of an application scenario of a transmission method according to Embodiment 3 of the present invention. detailed description
- Embodiments of the present invention describe a coupling device for a laser and an optical fiber.
- the coupling device shapes an optical signal incident on the laser, that is, converges or diverges the optical signal, so that the mode field diameter of the shaped optical signal and the optical fiber are The diameter of the core is matched and the optical signal can be efficiently coupled into the fiber.
- the coupling device of the laser and the optical fiber in the solution of the present invention and the transmission system and transmission method for optical signal transmission using the coupling device will be hereinafter described by way of specific embodiments.
- the present invention is not limited to the following embodiments.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- a first embodiment of the present invention describes a coupling device for a laser and an optical fiber.
- the coupling device includes an optical signal transmission component, and two ends of the optical signal transmission component are respectively included for a laser-coupled laser fixing member and a fiber fixing member for coupling with the optical fiber, wherein the laser fixing member is coupled to the laser means: a laser and a laser fixing member cooperate with each other, and the laser emits an optical signal to the laser fixing member;
- the coupling of the fixed component and the optical fiber means that: the optical fiber fixing component and the optical fiber cooperate with each other, and the optical signal is emitted from the optical fiber fixing component into the optical fiber.
- the optical signal transmission component is an internal refractive index grading component, and the refractive index closer to the central axis is larger, and the optical signal transmission component is capable of shaping the optical signal incident on the laser by designing the optical signal transmission component. (including the convergence or divergence of the optical signal), so that the mode field radius of the shaped optical signal is matched with the core radius of the optical fiber, and the optical signal can be efficiently coupled into the optical fiber.
- the refractive index at the central axis of the optical signal transmission component can be designed such that the difference from the refractive index of the optical fiber cladding is less than a threshold, that is, the refractive index at the central axis of the optical signal transmission component is designed to be
- the refractive index of the fiber cladding is the same or as close as possible. The advantage of this is that when the optical signal shaped by the optical signal transmission component enters the optical fiber, the reflection at the interface is minimized, thereby improving the optical signal entering the optical fiber. Coupling rate.
- the fiber cladding is used to wrap the outer portion of the fiber to protect the core.
- the mode field radius of the optical signal emitted from the optical signal transmission component may be determined according to the size of the optical signal transmission component, and therefore,
- the mode field radius of the optical signal emitted by the laser machine can be shaped to make the optical signal finally entering the optical fiber.
- the mode field radius is matched with the core diameter of the fiber to avoid serious mode mismatch between the two.
- the coupling device shown in FIG. 3 is described by taking a rectangular parallelepiped shape as an example.
- the coupling device may also adopt other shapes, such as a cylindrical shape, a spherical shape, an ellipsoid shape, etc., depending on the actual application scenario.
- the embodiment of the invention does not limit the appearance of the coupling device.
- the laser fixing component and the fiber fixing component are respectively located at two ends of the optical signal transmission component, and may be vertically designed or laterally designed as long as they are coupled with the laser fixing component.
- the optical signal incident by the optical device can pass through the coupling device and can exit into the optical fiber coupled to the optical fiber fixing member.
- the laser fixing member may be, for example, a socket, a hook or the like, capable of coupling the laser with the laser fixing member such that the optical signal incident by the laser enters the position of the coupling device.
- the fiber fixing member may be a spherical, ellipsoidal or V-shaped groove, and the optical fiber is fixed in the IHJ groove by using glue to realize coupling between the optical fiber fixing member and the optical fiber.
- the groove may be horizontal as shown in Fig. 3, or may be at an angle to the horizontal direction according to the actual application scenario.
- the fiber is coupled to the coupling device by the fiber optic mounting member such that the optical signal emerging from the coupling device enters the fiber at a fixed location.
- both the laser and the optical fiber are coupled to the optical signal transmission component, as long as the positional alignment is performed while the laser and the optical fiber are fixed, it is ensured that the optical signal emitted by the laser can accurately enter the core diameter of the optical fiber through the coupling device. It is not necessary to do real-time alignment in the field each time an optical signal transmission is required. Since the communication band cannot be recognized by the naked eye, special alignment equipment is required.
- the laser fixing component and the fiber fixing component can greatly simplify the alignment process, and also reduce the error caused by the surrounding environment caused by multiple alignment processes;
- the way of fixing the laser, the coupling device and the optical fiber together can also reduce the packaging difficulty and the integration cost, and improve the reliability of the application.
- the refractive index of the outer surface of the optical fiber fixing member may be designed to be smaller than the refractive index difference of the optical fiber cladding layer, that is, the refractive index of the outer surface of the optical fiber fixing member is the same as the refractive index of the optical fiber cladding layer or
- the advantage of this is: Since the outer surface of the fiber fixing member (ie, the outer surface of the groove) is in contact with the optical fiber, when the optical signal is transmitted to the surface of the optical fiber fixing member, if the outer surface of the optical fiber fixing member The refractive index is the same or close to the refractive index of the contacted fiber cladding, which mitigates the adverse effects of Fresnel reflection on the coupling ratio at the interface.
- the coupling device can be fabricated using materials that contribute to heat dissipation of the laser chip, such as silicon dioxide, silicon nitride, silicon oxynitride, and other polymeric materials or polymeric materials, and embodiments of the present invention are not practical for the coupling device. It is defined by the preparation materials used.
- the coupling method of the gradient-graded fiber can be prepared by referring to the preparation method of the existing tapered fiber (such as the preform method, the direct co-extrusion method), or the ion exchange process or the gas phase can be used.
- the deposition method is used for preparation, and the embodiment of the present invention does not limit the preparation process of the coupling device.
- the optical signal according to the embodiment of the present invention refers to: a light field that is emitted by the laser chip and includes modulation information.
- the laser chip is excited by an electric signal, and the laser-related driving circuit may be The external one can also be fixed together with the laser chip on the coupling device of the laser and the optical fiber.
- optical signal transmission unit in the coupling device
- example 1 and the example 2 are described by convening the optical signal as an example.
- the optical signal transmission component includes a first subcomponent and a second subcomponent, and the first subcomponent is inside. a layer component, the second subcomponent being an outer component, the first subcomponent being wrapped within the second subcomponent.
- the first sub-component is a sub-component having a graded index of refraction, the closer the refractive index is to the central axis, the greater the refractive index at the position closer to the center of the circle in any cross-section.
- the first sub-part is in the form of a truncated cone whose radius of the cross-section gradually changes. It is assumed that: the optical signal is transmitted from the bottom of the first sub-assembly to the top, that is, the transmission direction of the optical signal in the first sub-assembly is from the first sub- The bottom of the component is transferred to the top, and if the radius of the cross section becomes smaller, the first subcomponent can converge the optical signal; if the radius of the cross section becomes larger, the first subcomponent can diverge the optical signal .
- the second sub-assembly is a sub-component having a constant refractive index, and the second sub-assembly encloses the first sub-assembly such that the entire optical signal transmission member has a rectangular parallelepiped.
- the embodiment of the present invention does not specifically define the shapes of the first sub-component and the second sub-component, and the second sub-component may have other shapes such that the entire optical signal transmission component has a shape such as a cylindrical shape, a spherical shape, or the like.
- the optical signal emitted by the laser is incident from the bottom of the first sub-component and exits from the top.
- the first sub-component needs to have The ability to shape an incident optical signal.
- the mode field radius when the optical signal is emitted from the first sub-component is related to the cross-sectional radius of the exit position of the first sub-component
- the larger the cross-sectional radius of the exit position of the first sub-component, the optical signal from the first sub-component The larger the mode field radius when exiting, therefore, a plurality of coupling devices can be prepared in advance, and the cross-sectional radius of the exit position of the second sub-component in each coupling device is different, so as to be used according to the actual optical fiber used in the transmission process. Select the appropriate coupling device for the core diameter.
- the cross section of the first sub-component gradually becomes smaller in the transmission direction of the optical signal, and therefore, the mode field radius of the optical signal gradually becomes smaller, and the optical signal is concentrated.
- the mode field radius of the optical signal will gradually become larger, so as to achieve the purpose of diverging the optical signal.
- the desired mode field radius is used to determine the shape parameters of the first sub-assembly based on the appropriate cross-sectional radius length. Referring to Figure 4, the mode field radius of the optical signal as it travels through the first sub-assembly (the thick solid line in Figure 4) is shown by the dashed line.
- the refractive index distribution is on any cross section:
- the rate distribution is squared.
- ⁇ Zi i «Z ⁇ .
- the difference between the refractive index and the cladding of the optical fiber is less than a threshold, preferably as close as possible to the refractive index of the cladding of the optical fiber to increase the coupling ratio of the optical signal into the optical fiber.
- the optical signal is the mode field radius at the corresponding cross section; "in equation (3) refers to any cross-sectional radius in the first sub-assembly, if here is the mode indicating the time of the shot Field half
- the diameter here is specifically referred to as the top cross-sectional radius of the first sub-component (ie, the cross-sectional radius of the first sub-component at the exit position of the optical signal).
- the above formula (7) is a relational expression between the cross-sectional radius of the first sub-component and the mode field radius of the optical signal, but the embodiment of the present invention is not limited to other relational expressions to represent the cross-sectional radius of the first sub-component.
- the relationship between the mode field radius of the optical signal is not limited to other relational expressions to represent the cross-sectional radius of the first sub-component.
- the optical signal transmission component includes a third subcomponent and a fourth subcomponent, and the third subcomponent is a lower component, the fourth subcomponent being an upper component, and the fourth subcomponent being coupled to the third subcomponent at an optical signal exiting position of the third subcomponent.
- the third sub-assembly has a cylindrical shape with a constant cross-sectional radius.
- the third sub-component is a sub-component having a graded index of refraction, the closer the refractive index is to the central axis, the greater the refractive index at the position closer to the center of the circle in any cross-section.
- the fourth sub-component is a sub-component having a constant refractive index, and the refractive index of the fourth sub-component is the same as the refractive index at the central axis of the third sub-component.
- the difference between the refractive index of the fourth sub-component (ie, the refractive index at the central axis of the third sub-assembly) and the refractive index of the cladding of the fiber is less than a threshold, preferably as close as possible to the refractive index of the cladding of the fiber to enhance light.
- the coupling ratio of the signal incident to the fiber is less than a threshold, preferably as close as possible to the refractive index of the cladding of the fiber to enhance light.
- the fourth sub-assembly is also cylindrical, such that the entire optical signal transmission member has a cylindrical shape.
- the embodiment of the present invention does not specifically define the shapes of the third sub-component and the fourth sub-component.
- the third sub-component and the fourth sub-component are in a cubic shape such that the entire optical signal transmission component also has a cubic structure.
- the optical signal emitted by the laser is incident from the bottom of the third sub-assembly, exits from the top of the third sub-assembly and enters the bottom of the fourth sub-assembly, and finally exits the fiber from the top of the fourth sub-assembly.
- the third subcomponent needs to have the ability to shape the incident optical signal.
- the mode field radius when the optical signal is finally emitted is related to the length of the third sub-component, the longer the length of the third sub-component, the optical signal
- the threshold value is a critical value, and if the length of the third sub-component is greater than the threshold value, the third sub-component may be opposite to the light
- the signal is concentrated, and the longer the length of the third sub-component, the higher the degree of convergence of the optical signal; if the length of the third sub-component is less than the threshold, the third sub-component can be optical signal
- the divergence is performed, and the shorter the length of the third sub-component, the higher the degree of divergence of the optical signal.
- the wavelength in the vacuum; g is the focusing parameter, and 2 is the refractive index of the fourth sub-component, that is, the refractive index at the central axis of the third sub-assembly.
- the optical signal is concentrated, and the optical signal incident by the laser is shaped by the third sub-component and then focused on the top of the fourth sub-component (length L2), see the dotted line in FIG. .
- the fourth sub-component is a component having a constant refractive index, even if there is no fourth sub-component, the optical signal can be directly transmitted to the optical fiber after being shaped by the third sub-component; considering the suitable size of the coupling device and the third sub- The size of the component is designed. If the dimension of the third sub-component is designed to be shorter, a fourth sub-component of a suitable length can be designed.
- the interior of the third sub-assembly shown in Figure 5 can also be designed in accordance with the inner-outer structure described in Example 1.
- first sub-component and the second sub-component involved in the example 1 and the example 2 The "first”, “second”, “third”, and “fourth” in the third sub-component and the fourth sub-component are used to distinguish each sub-component, and do not limit the actual structure and size of the sub-component. .
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the second embodiment of the present invention describes a transmission system for an optical signal.
- the transmission system includes a coupling device and a laser for the laser and the optical fiber.
- fiber where:
- the laser and the optical fiber are respectively coupled to the coupling device through a laser fixing member and a fiber fixing member in the coupling device, and an optical signal emitted by the laser is transmitted to the light via a refractive index-graded optical signal in the coupling device After the signal is concentrated or diverged, the outgoing optical signal enters the fiber.
- the coupling device of the appropriate structure and size can be selected according to the description of the example 1 or the example 2, so that the mode field radius of the optical signal emitted by the coupling device and the core radius of the optical fiber are The difference is less than the set threshold, that is, the mode field radius of the outgoing optical signal is matched with the core radius of the fiber.
- the optical signal can be concentrated by reducing the cross-sectional radius of the first sub-component at the exit position of the optical signal, or by increasing the first sub-component in the light.
- the cross-sectional radius of the signal exiting position may diverge the optical signal such that a difference between a mode field radius of the optical signal exiting the coupling device and a core radius of the optical fiber is less than a set threshold; or
- the coupling device uses the structure of Example 2, concentrating the optical signal by increasing the length of the third sub-component, or diverging the optical signal by reducing the length of the third sub-component, such that The difference between the mode field radius of the optical signal emitted by the coupling device and the core radius of the optical fiber is less than a set threshold.
- the laser is fixed to the coupling device by a slot, a hook (ie, a laser fixing member), and the like, and the optical signal is incident perpendicularly to the coupling device; the cylindrical fiber end is fixed to the coupling device by the glue horizontally. Inside the groove (ie the fiber fixing part).
- the light signal emitted from the coupling device is a vertical direction
- the core diameter direction of the optical fiber is a horizontal direction, in order to make the light
- the signal enters the core diameter of the fiber, and the tail end of the fiber can be designed to be a cut surface at a set angle (such as 0 angle), so that the optical signal after passing through the fiber cladding is incident on the cut surface of the fiber end at a 0 angle. Reflection occurs on the tangential surface to change the direction of transmission of the optical signal, and the optical signal can be transmitted along the core diameter of the optical fiber in the optical fiber.
- the direction of transmission of the emitted optical signal is 90 degrees to the core diameter of the optical fiber, and the angle of 45 can be designed to reflect the optical signal in the vertical direction.
- the 0 angle also changes correspondingly, for example, when the tail end of the optical fiber is vertically fixed in the recess of the coupling device (ie, The angle between the direction of the core of the optical fiber and the direction of transmission of the outgoing optical signal is 0 degrees, and the angle of 0 is 0 degrees.
- the reflective layer may be covered on the cut surface of the fiber end, and may be a metal reflective layer or a reflective layer of other materials, which may be a single reflective layer or a Bragg mirror composed of a multilayer film. Or an end face etched reflective grating.
- the reflective layer is used to reduce the leakage of optical signals occurring at the surface of the groove, so that as many optical signals as possible are reflected into the core diameter of the optical fiber to improve the coupling ratio of the optical signal.
- the optical fiber according to the second embodiment of the present invention may be a standard single-mode optical fiber for receiving, or may be another type of optical fiber.
- the standard single mode fiber includes, but is not limited to, G.652, G.653, G.654, G.655 as defined by the International Electrotechnical Commission (IEC) and the International Telecommunication Union Telecommunication Standardization Organization (ITU-T). G.656 and Bl.l, B1.2, B1.3 and B2, B4 and other single-mode fibers, the material of the fiber is made of, but not limited to, silicon dioxide and the corresponding polymer.
- the laser according to the second embodiment of the present invention is divided into a wavelength of 850 nm, a wavelength of 1310 nm, a wavelength of 1550 nm, and the like according to the wavelength of the emitted light.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- the third embodiment of the present invention describes an optical signal transmission method based on the transmission system according to the second embodiment. As shown in FIG. 7, the method includes the following steps:
- Step 101 Driving a laser chip coupled to the coupling device, the laser chip emitting an optical signal containing modulation information, and the optical signal enters an optical signal transmission component having a refractive index gradient in the coupling device.
- Step 102 When the optical signal is transmitted in the optical signal transmission unit, the optical signal is concentrated or diverged.
- Step 103 When the concentrated or diverged optical signal is transmitted to the interface between the coupling device and the optical fiber, it is emitted into the optical fiber cladding.
- Step 104 After the optical signal passes through the fiber cladding layer and is reflected by the 0-angle of the fiber end (the tangential surface is covered with the reflective layer), the transmission direction of the optical signal changes, and enters the core diameter of the optical fiber and transmits along the core diameter. Thereby the transmission process of the optical signal is completed.
- the designed coupling device uses a structure with a gradient of the refractive index to shape the mode field of the incident optical signal (including convergence or divergence), and the mode field radius of the finally exited optical signal is shaped to be the core diameter of the optical fiber.
- the size of the matching avoids the difference between the mode field radius of the optical signal emitted by the laser and the core diameter of the optical fiber, which causes a serious mismatch in the mode field, so that the optical signal can be efficiently coupled into the optical fiber;
- the exiting light of the VCSEL is directly different from the core diameter of the single-mode optical fiber, and there is a serious mode mismatch between the two.
- the solution of the VCSEL can be concentrated by using the solution of the embodiment of the present invention.
- the diameter of the optical signal emitted from the coupling device is matched with the diameter of the core of the single-mode fiber, and the optical signal emitted by the VCSEL can be efficiently coupled into the single-mode fiber.
- the refractive index at the central axis of the coupling device and the refractive index at the interface with the fiber are close to the refractive index of the fiber cladding, so that the reflection at the interface is minimized, further improving the coupling efficiency;
- the reflective layer covered on the end can reflect almost all of the incident light signal into the core diameter of the fiber, again increasing the coupling ratio.
- the laser and fiber are coupled to the coupling device, reducing the error caused by multiple installations of the device and reducing packaging difficulty and integration costs.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
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Priority Applications (6)
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JP2016548731A JP2017504839A (en) | 2014-01-29 | 2014-01-29 | Apparatus, optical signal transmission system and transmission method for coupling laser and optical fiber |
CN201480000903.8A CN105359017B (en) | 2014-01-29 | 2014-01-29 | The coupling device of laser and optical fiber, light signal transmission system and transmission method |
EP17185046.4A EP3336590B1 (en) | 2014-01-29 | 2014-01-29 | Apparatus for coupling laser and optical fiber, and optical signal transmission system and transmission method |
EP14881080.7A EP3093696B1 (en) | 2014-01-29 | 2014-01-29 | Device for coupling laser and optical fiber and optical signal transmission system and method |
PCT/CN2014/071752 WO2015113246A1 (en) | 2014-01-29 | 2014-01-29 | Device for coupling laser and optical fiber and optical signal transmission system and method |
US15/222,462 US9851514B2 (en) | 2014-01-29 | 2016-07-28 | Apparatus for coupling laser and optical fiber, and optical signal transmission system and transmission method |
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PCT/CN2014/071752 WO2015113246A1 (en) | 2014-01-29 | 2014-01-29 | Device for coupling laser and optical fiber and optical signal transmission system and method |
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US15/222,462 Continuation US9851514B2 (en) | 2014-01-29 | 2016-07-28 | Apparatus for coupling laser and optical fiber, and optical signal transmission system and transmission method |
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US (1) | US9851514B2 (en) |
EP (2) | EP3093696B1 (en) |
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JP2017504839A (en) | 2017-02-09 |
EP3093696B1 (en) | 2021-06-02 |
EP3336590B1 (en) | 2019-03-13 |
US20160334589A1 (en) | 2016-11-17 |
EP3093696A1 (en) | 2016-11-16 |
EP3093696A4 (en) | 2017-01-18 |
CN105359017A (en) | 2016-02-24 |
US9851514B2 (en) | 2017-12-26 |
CN105359017B (en) | 2017-12-15 |
EP3336590A1 (en) | 2018-06-20 |
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